THIN-FILM PLANAR WAVE-GUIDE SENSOR FOR LIQUID-PHASE ABSORBENCY MEASUREMENTS

被引：42

作者：

DEGRANDPRE, MD

BURGESS, LW

WHITE, PL

GOLDMAN, DS

机构：

[1] UNIV WASHINGTON, DEPT CHEM, CTR PROC ANALYT CHEM, BG-10, SEATTLE, WA 98195 USA

[2] PACIFIC NW LAB, RICHLAND, WA 99352 USA

来源：

ANALYTICAL CHEMISTRY | 1990年 / 62卷 / 18期

关键词：

D O I：

10.1021/ac00217a021

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

A thin film planar waveguide is studied for application as a chemical sensor for liquid-phase absorbance measurements. The waveguide Is comprised of a thin film of tantalum pent-oxide deposited on a glass substrate with a pair of diffraction gratings etched into the substrate surface. The buried grating couplers allow the launch and collection optics to be isolated from the liquid sample. The response to an absorbing dye and different refractive Index (RI) solutions is studied and compared to theoretical predictions. The sensor has an absorbance sensitivity equivalent to a 1 mm path length in a conventional transmission measurement. A method to reduce the Intensity changes due to solution RI is demonstrated. © 1990, American Chemical Society. All rights reserved.

引用

页码：2012 / 2017

页数：6

共 29 条

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ADAM NK, 1964, ADV CHEM SER, V43, P55

[2]

BOHN PW, 1989, PROG ANAL SPECTROSC, V12, P41

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